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The waste ink absorber is almost full. Press [OK] to continue but early replacement recommended. <See manual>WASTE INK NEAR FULL
The printer has a built-in waste ink absorber to hold the ink used during print head cleaning, for example. This error message indicates that the waste ink absorber is nearly full.
Press the OK button to cancel the error so you can continue printing.
Before the waste ink absorber becomes completely full, contact a Canon service representative. (You will need to replace a particular part of the printer.) Canon recommends that you call for service as soon as this error occurs. Once the waste ink absorber becomes completely full, printing cannot be performed until the Waste ink tank is replaced.

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Hi
Not perhaps as helpful as we would both prefer but all the manual (which can be found here:-Canon PIXMA MX410
and downloaded and installed to your computer) says about this 5b00 error is:- "The machine error has occurred. Contact the service center."
A slightly better idea is on the Canon site herePIXMA Printer Error Codes and Error Messages
Good Luck